[IPV6] Fix rtnetlink dump infinite loop

[Herbert Xu]

Hi:

The recent change to netlink dump "done" callback handling broke IPv6
which played dirty tricks with the "done" callback.  This causes an
infinite loop during a dump.

The following patch fixes it.

This bug was reported by Jeff Garzik.

Signed-off-by: Herbert Xu <[EMAIL PROTECTED]> 

Thanks,
-- 
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Email: Herbert Xu ~{PmV>HI~} <[EMAIL PROTECTED]>
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diff --git a/net/ipv6/route.c b/net/ipv6/route.c
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1701,10 +1701,8 @@ static void fib6_dump_end(struct netlink
                fib6_walker_unlink(w);
                kfree(w);
        }
-       if (cb->args[1]) {
-               cb->done = (void*)cb->args[1];
-               cb->args[1] = 0;
-       }
+       cb->done = (void*)cb->args[1];
+       cb->args[1] = 0;
 }
 
 static int fib6_dump_done(struct netlink_callback *cb)